Arrieta will make his 2014 debut against the St. Louis Cardinals on Saturday. He missed the first month of the season with right shoulder tightness.

The right-hander was traded from Baltimore to Chicago on July 2 last season and then compiled a 4-2 mark with a 3.66 ERA in nine games with the Cubs.

Sweeney, who is dealing with a right hamstring strain, is batting .200 with two doubles and six RBI in 20 games this season.

The Cubs also selected the contract of outfielder Chris Coghlan from Triple-A Iowa, optioned pitcher Zac Rosscup to Iowa and transferred pitcher Kyuji Fujikawa from the 15-day disabled list to the 60-day disabled list.

In 2013, Coghlan was limited to 70 games with the Marlins due to a right calf injury and batted .256 with 10 doubles, one homer and 10 RBI.